//
//  Atom.h
//  first class
//
//  Created by 李尹卓 on 16/4/5.
//  Copyright © 2016年 李尹卓. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Atom : NSObject

@property (readonly) NSUInteger protons;
@property (readonly) NSUInteger neutrons;
@property (readonly) NSUInteger electrons;
@property (readonly) NSString *chemicalElement;

- (NSUInteger)massNumber;
@end